In JAPAN ~ According to Dr. Kanichi Mori, Shiitake mushrooms have more vitamin B12 than milk and fish.

Brief: ~ Certain types of Mushrooms are unique in that they contain Vitamin B12, something that vegetables can’t produce at all. Since B12 is mainly of animal origin, deficiency is commonly associated with vegetarian diets. Mushrooms were found to contain 0.32-0.65 mg per gram of B12, allowing just 3 g of fresh mushrooms to provide the RDA of this vitamin. Vegetarians may find this a useful way of getting this important nutrient. ~ more at http://www.polymathium.com ~ This is possibly due to a subtle, potential symbiotic relationship that occurs between the three parties involved… humans, mushrooms, and B12 producing bacterium.